================================================================== BUG: KCSAN: data-race in complete_signal / ptrace_attach write to 0xffff88812d2850b0 of 4 bytes by task 9902 on cpu 0: ptrace_attach+0x243/0x510 kernel/ptrace.c:424 __do_sys_ptrace kernel/ptrace.c:1297 [inline] __se_sys_ptrace+0xc1/0x1b0 kernel/ptrace.c:1277 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1277 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812d2850b0 of 4 bytes by task 9907 on cpu 1: complete_signal+0x453/0x600 kernel/signal.c:1046 __send_signal+0x680/0x760 kernel/signal.c:1194 send_signal+0x281/0x390 kernel/signal.c:1257 do_send_sig_info kernel/signal.c:1306 [inline] do_send_specific+0x13d/0x1c0 kernel/signal.c:3856 do_tkill kernel/signal.c:3882 [inline] __do_sys_tkill kernel/signal.c:3917 [inline] __se_sys_tkill kernel/signal.c:3911 [inline] __x64_sys_tkill+0xe2/0x120 kernel/signal.c:3911 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000 -> 0x00010001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9907 Comm: syz-executor.5 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================